package com.hugboy.stringbuilder;

public class Demo2stringbuilder {
    public static void main(String[] args) {
        StringBuilder sb = new StringBuilder();
        System.out.println(sb); // 一个空白可变的str对象

        StringBuilder sb2 = new StringBuilder("abc");
        System.out.println(sb2);  // 有初始值的可变str对象
    }
}
